YTBlock is a free Firefox extension designed to enhance user control over YouTube content. It offers a range of features that allow users to block unwanted videos, channels, and comments based on various criteria. Users can create a blacklist of words and phrases, utilize regex for more complex filtering, and even block content by video title, category, tags, and more. This level of customization empowers users to tailor their YouTube experience to their preferences.

In addition to blocking specific content, YTBlock provides options for managing playlists, including the ability to block by channel or title. The extension supports toggling block overlays and includes password protection for added security. Users should note that access to certain information, such as tags and categories, requires a Google API key, with instructions provided within the extension. Overall, YTBlock offers a robust solution for those looking to curate their YouTube experience.